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Number systems are just different ways of writing the same number. Binary (base 2) is what processors use at the lowest level, hexadecimal (base 16) is a compact way to write binary data in code, and decimal is the everyday human notation.

How to use it

• Enter a number in any field (binary, octal, decimal, hexadecimal, or a custom base 2-36) — every other field updates instantly.
• For a custom base, pick any value from 2 to 36 — handy for less common systems, like base36 used in short identifiers.
• Characters invalid for the selected base (like a "2" in binary) are flagged as an input error.

Common uses

• Converting a hex color or byte value into a decimal number for calculations.
• Checking a bitmask or set of flags written in binary.
• Working with low-level code (network protocols, embedded systems) where values are often given in hex or octal.

Things to keep in mind

In hexadecimal, the letters A-F (or a-f) stand for the values 10-15 — case usually doesn't matter.

For bases above 16, digit symbols keep going further down the alphabet (G, H...) up to Z for base 36.